Chuck-retaining device.



G. H. GILMA'N. I CHUCK RBTAINING DEVICE. APPLIGATION FILED MAY 1s, 19o?. 1,193,009, Patented July 7,1914.

G. H. GILMAN. CHUCK RETAINING DEVICE.

APPLICATION'IILED MAY 13, 1907,

1,1 03,009. Patented July 7,1914,

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- x RM/*Jf A f ms suenen nfeiLMAiv, eren unirsi) sTnTns PATENT orricn MENTS, To sULmyan conrona'rron or lnassncnnsnrrs.

f T all whom z't-may/ concern 2, and the left or opposite end, to receivea f 1 State of New `Hampshire, Improvement in Chuck-Retaining Devices,

'rock drills or other particularly, "thou gh @not exclusively, concerned with tool retaining matie'v hammer drills.

arrangement of parts, understood and .appreciated by reference to the following description,

Vconnection with the accompanying draw- ,tratioin its scope pointed out in the Aappended claims.

-ployed for drilling rock. `sists of a suitable cylinder Be it known that I, Grenen H. GiLMAN,

,fa citizen ofthe United States, residing at Claremonu inA the county lof Sullivan and have inventedah description, in conof which the following `'nection with the accompanying drawings, 1s a specification, likeY lettersy on the draw`r ings representing lileparts. f i

zMy invention relates yto chuck" retaining deviecs forthe tools of` pneumatic hammers,

like.v devices, being more devices forlpneu-` generally, to improve devices of this type and comprises ,novel features of construction, combination and which .will be best My invention aims,

when taken in ings, of a device embodying one form of my invention and selected for purposes ofillusbeing more particularly In the drawings: Figure 1, is an elevation,

vin partial longitudinal section, of a rock drill apparatus embodying one forni of my -invention selected 'for illustration herein.

Fig. 2, a longitudinal section of the drill end of the cylinder to show the construction and arrangement of my improved chuck retaining -device therein. Fig. '8, a transverse section on the line 3- 3, Fig. 2; Fig. 3a, a perspective view of the inner locking ring; Fig. 4, an'end elevation of the drill carrying end of the cylindemFigs. 5 and 6, are respectively longitudinal and transverse sections of tlie drill end of the cylinder illustrating a modiied, construction o f chuck retaining devices; Figs. 7and 8,cnd 9 and 10 are views, similar and corresponding yto Figs. 2 and 3, of 'other modified forms,

Referring to the drawings and the particular embodiment of my invention selected for illustration therein, I have illustrated my invention as applied to an ini-.proved pneumatic hammer tool, herein a drill, ein- The device con- 1, Fig. l, open at both ends, one, the right, to receive the drill MACHINERY COMPANY, or BOSTON, .Massacnnsnr'ra Specification of Iietters Illatentrv sudati@ feeding adapted to be turned by hand yciprocatory 'action of the ying plug er hammer4 5,

v,throughan operating handle 7, l*

,receiving end of the cylinder has, as'

piston 3, by which the drill. ,T he cylinder is during the re; drill by means of a radially or transversely extending handle Ll and isl interiorly provided with suitable devices .for periodically actuating the drill. Totliis end and in the present infetance, the

isfheld up against its work.

ydrill is struck a series .of rapidly recurring reeiprocatory strik- Fig., l, the head of Which is shown at the left of Figs. i5.. 7 and 9, said hammer bcingslidably mounted Within saidy cylinder and actuated by a suit 'able motive fluid, heroin-air,` 'which is adinitted through the pipe 6 and controlled l., the

latter also acting to control tlieadniission of air to the feeding cylinder and its pis-u ton 3.

Referring now to Figs. 52 and A3, the drill percussive, blows by a cylindrical rea longitudinally extending cess, the outer end of which is slightly engreater Y diameter to receive a bushing, 8. liisosely larged or provided Twith aportion ol.'

seated therein against a shouldered. partum 9 on the innersurface of the cylinder.l 'lhify y K resented Jury a', rara. v., Appiieation med Mayis, i907. seriaiN. 373,319.

heren.

Anunciar, new HAMPSHIRE, Assienonnr vinnanzi .assiembushing'is centrally provided with an axial.

opening, preferably polygonal in cross .see-v tion orprovided with angular faces, to receive the drill and which the latter, of.y

corresponding cross sectional area, freely reciprocates but preventing it 'from rotary movement.

To prevent the bushing and hence 'the 1 drill from rotating within or independently of the cylinder, suitable means are provic il, comprising in one.form of my invention. Figs. 2 to 3, a slot 10 extending transversely across the ends of the bushing and cylinder and adapted to receive radially and inwardly extending projections or lugs, 11, on'the inner face of a lock .ring 19. said lugs being the counterpart of and closely fitting into said slot yand thereby preventing rotary movement of the bushing within the cylinder, but causing it to move therewith when the handle, 4, is turned in operating the drill. This ring is normally clamped or retained in its inner locking'position b v means of a slit locking sleeve 13,"'threaded at 14, Fig. 2, and provided,at the sides of the slit port1on'there`of,'with ears' v15, Figs?,v b

clamping bolt '16, theV and 4:,which receive a latter in turn receiving a nut 17 by which thesleeve is rigidly clamped tothe cylinder, which clamps the bushing and lock ring therein and' prevents relative longitudinal,

rotary or other movement therein.

Said

sleeve, 18, is centrally provided'vvith a circular 'aperture slidably and loosely `to receive the shank ofv the drill and the lock lring 12 `and said bushing are Iprovided with apers .the present instance,

'By' this construction rotary movement of the 'upo'n'turning the 'cylinder by tures or recesses alined therewith, which in are bot-h' polygonal, hereinj hexagonal, in cross section to receive the "similarly formed shank of the drill.

drill Within `the bushing and said locking sleeve are lprevented While reciprocal move- 'ment is freely permitted. Furthermore, means of the operating handle 4, Fig. 2, the drill is positively rotated in the saine direction and' simultaneously with the' cylinder, the engaging ends of thefeeding piston and the drill forming the pivots'aboutwhich lsaid cylinder may be turned. y

Although my invention, in some of its feay, tures, may be usefully applied to threaded bushings, the embodimentthereof just described has the advantage of requiring no coperating threaded surfaces between the cylinder and the: bushings, it being a matter of great difficulty to harden the threaded parts Without destroying their iitf In the above embodiment the fitrequired is' not necessarily other than approximate, so that the parts may be hardened and still be interchangeable With other like parts. This construction, furthermore, as in the modifications presently described, is distinctly advantageous over chuck retaining devices or bushings Which are retained Within the cylinder through the provision of coperating threaded surfaces just referred to, not onlyf because y of the difficultyin -hardeningfthem and to produce threads of uniform dimensions, but also because of the expansion produced during the operation of the machine and WhichA practically, prevents the removal of the bushings Withoutdriving. l

Invthe modified construction represented in Figs. 5 and 6, the lockingf-ring 12 is omitted and in place thereof the outer face large portion of the cylinder are respectively provided with opposed longitudinal recesses, '18 and 19, herein semicirculargrooves, to receive a key 20, which prevents movement of one relative to the other. AFor retaining the key Ain its bushing in, inner position and vto lock thev bushingagainst rotaryaet-iomf' of the bushing and theinner face of the ,also prevents longitudinal movement of the mining.,y l c y j In the modificati nshown in Figs. 7 and '8, the bushing is similar to that described, the,threaded end of the cylinder however, belng slit longitudinally to form three similar segments 22, Fig. 8, and l:exteriorly threaded for ay vclamping 'or locking sleeve v21, which' isals'o similar in all/respects to that already described., This sleeve may be turned on the cylinderto force thegouter split. ends 'of the latter/inward `or toward one another, the. clamping nut 17. and bolt 16 then being adjusted' to rigidly clamp the p cylinder against the bushing to prevent relativey or independent `movement thereof,y l, Referring noviT to Figs and 1 0 andjto theniodicat-ion shown therein,.theend"of the cylinder 1, in the present yinstance,fis slit radlally toward its yupper` side, 'as 'best shown in Fig. y10, andis provided, at the sides of the slit, with ears y2sfsuitab'ly,apertured to receivea clamping boltvpro'vided with a nut 25 by which the; split portions of the cylinder may be forced togetherto clamp them rigidly against thellgnshing vvto prevent its rotation or relative movement.

-In thel construction shown inF-igs 7gto 10, wherein the adjacent ends of th ylinder are slotted or cut part Way down cafard' the center, both longitudinal and frotary movement of y, the bushing is obviously prepermits removal'of the bushing, the locking t ring, or the key 20, as the case may be.

So far as I am'aware, this is the first instance inl the art in :which 'any means have been. provided which permitfthe ready removal of the drill and afford access tothe striking plug, all machines of this typewith kwhich I am familiar necessitating the dismantling of the machine'to a. greater or, less extent and necessitating 0 driving out `the bushingjby a drift or similar tool..

-While I have described my invention with 4 i relation tio a -tool for drillingrock obviously y my invention is notplimitedthereto, nor to the specific construction and arrangement of parts herein selected for purposes of illustration only, theI same being, capable` of `modiieation Within Wide -,limits without de- ,partingfrom {I- clainJi---f4 An"'appar'atu'sv of the.' ytype described provided withA arcylinder having an axial-1rethel spirit and scope thereof.

,cess presenting an enlarged' 'portie-n.- of i' greater diameterat one end thereof and an interior shoulder, anaxially apertured'bus`hing loosely'.received insaid enlarged .por-

tion and abutting said shoulder, said bush# ing and an adjacent portion of said cylinder together presenting a recess, a part thereof 'being in each, a locking member arranged inf]v il v`said recess, and a sleeve for retaining the catory movement of a tool therein.

2. A device of the class described having a v`tool receiving end .provided with a loiugitudinall extending recess forming an i n terior s oulder, a bushing having angular .faces on the interior thereof, mounted in 'saidrecess and seated against said shoulder,

the tool receiving end'and said bushing havopposed recesses, locking means arranged in said recesses for preventing rolvtary movement of saidbu'shing relative to.

said end, a tool having angular faces formed to lit the-interior of said bushing and an ap'ertured cap clamped to the end of said device to prevent longitudinal nov'ement of said bushing and said locking means rela tive to said end and to permit free sliding movement' of said tool therein.

1,3.- An apparatus of 'the' type described provided with a cylinderhaving an exteriorly threaded end, atool receiving bush-v ing permitting longitudinal movement of the; said tool' therein and having means to prevent rotation of the tool therein, an interiorly threaded sleeve positioned upon the threaded end of said cylinder for preventing outward endwise movement of the bushing, and holdingmeans coperating with the cylinder, the sleeve and the bushing and 'enn gaging the bore of the cylinder and the outer walls of the bushing for rigidly-hold- Aing the latter WithinI said cylinder to prevent rotary movement of said bushing therein.

il. An apparatus of the type described, comprising in combination, ya. cylinder, a tool, a piston hammer 'adapted to vstrike repeatedly the end of said tool, a bushing mounted in the end of said cylinder adapted to be inserted by a longitudinal sliding. movement thereof, said bushing having a non-circular openingin which said tool is non-rotatable but slidably mounted, and means including a part clamped on the end of said cylinder for preventing both longitudinal and rotary movement of the bushing therein,

5. .An apparatus of l. the type described, provided with a cylinder having within one .end thereof a bushing for receiving a vreclprocatory tool therein, said tool being biliari-qi` (rotatably held bv the bushing, and n'cea'nsfv ,"to ,lockf saidv bushing against rotativeA and-' 4 lengthwise movement including an interiorly 1 threaded split cap 'for holding said Bushing within said cylinder, and clamping means to clamp the cap to said cylinder.

6. An apparatus of the class described, comprising, in combination, a cylinder, a bushing located in said cylinder, a member encircling the end of said cylinder, vand a member interposed between and interenga'ging withl the outer end of said bushing and said encircling member and held in position by said encircling member. 3 47. An apparatus of the type described, comprising, in combination, a cylinder provided at one end with a bushing-receiving cylindrical lrecess terminating at its inner end in a shoulder, a bushing located within Iand slidably fitting said recess, and clamp-A ing means to clamp said bushing in said cylindex'.

8. An apparatus of the type described, comprising, in combination, a cylinder provided at one end with a bushing-receiving cylindrical recess terminating at its inner end in a shoulder, a bushing located within and slidably tting said recess, and means for positively locking said bushing against rotation, and holding the same against lengthwise movement including an internally threaded sleeve encircling and threaded onto the end of said cylinder, andA clamp-V ing means to clamp said sleeve to said cylinder.

9. An apparatusgof the type described, comprising, in combination, a cyhnder provided at one end with a bushing-receiving cylindrical recess terminating at its inner end in a shoulder, a bushing located' within and slidably fitting said recess, and means for locking said bushing against rotatlve and-lengthwise movement including means interengaging with said bushing, an internally threaded split sleeve encircling and threaded onto the end oi' said cylinderand means to contract said sleeve to clamp the same to the cylinder.

ln testimony whereof, l have signed my name to this specication, in the presence of two subscribing witnesses,"

GEQRGE H.l GILMAN. Witnesses:

- El J'. BURGHARD,

J. A. Banani los 

